Order a matrix A 4x4 in another matrix B 6x6

Question

JOSUE PÁNCHEZ 2021-11-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1595134-order-a-matrix-a-4x4-in-another-matrix-b-6x6

编辑： DGM 2021-11-24

I want to insert elements of my matrix R1(1,1); R1(1,2); ...R1(i,j) in specific positions in my matrix G=zeros(6)

G=zeros(6)
R1=[0.1680    0.8400   -1.6800    0.8400
    0.8400    5.6000    0.8400    2.8000
   -0.1680   -0.8400    0.1680   -0.8400
    0.8400    2.8000   -0.8400    5.6000]
G(i,j)=G(i,j)+R1(i1,j1)
G

So I want in G(3,3) the value of R1(1,1), in G(3,4) the value of R1(1,2) and so on, I dont know how to do a code for that

If you could help me I'd appreciate it

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Answer 1

DGM 2021-11-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1595134-order-a-matrix-a-4x4-in-another-matrix-b-6x6#answer_839584

编辑：DGM 2021-11-24

在 MATLAB Online 中打开

Something like this:

G = zeros(6);
R1 = [0.1680    0.8400   -1.6800    0.8400
    0.8400    5.6000    0.8400    2.8000
    -0.1680   -0.8400    0.1680   -0.8400
    0.8400    2.8000   -0.8400    5.6000];
% your example shows the sum
G(3:end,3:end) = G(3:end,3:end)+R1 % if you want the actual sum
G = 6×6
         0         0         0         0         0         0
         0         0         0         0         0         0
         0         0    0.1680    0.8400   -1.6800    0.8400
         0         0    0.8400    5.6000    0.8400    2.8000
         0         0   -0.1680   -0.8400    0.1680   -0.8400
         0         0    0.8400    2.8000   -0.8400    5.6000
% alternatively
G(3:end,3:end) = R1 % if you just want to replace that part of G